Rats subjected to extreme electromagnetic fields produce dangerous levels of the toxic gas ozone, according to a new study out of the Pacific Northwest National Laboratory that is sure to reenergize the decade-dormant debate about safety around power lines and household appliances.

It is the first experiment to conclusively link an electromagnetic field with a health-adverse chemical effect in the presence of an animal, said Steven Goheen, a scientist at the Department of Energy lab and lead author of a paper published in the current issue of the journal Bioelectromagnetics.

"All this time, we were looking in the wrong place," Goheen said. "We had been looking inside animals for an effect from the electromagnetic fields. Now it appears that the danger is in the air surrounding animals that are near a large electromagnetic field."

Electromagnetic fields are present in devices that use or carry electricity. Goheen and colleagues report that the ozone was produced when rats were present during a "corona discharge," an uncommon phenomenon in which electrons escape from a sharp surface of an electrical conductor at high voltage.

The researchers placed rats in a Plexiglas cage hooked up to a device that produced 10 kilovolts, or roughly the power of air ionizers marketed as health aids. In an empty cage, the ozone level peaked at 22 parts per billion with or without a corona discharge. When the animals were present and a centimeter from the corona source – an electrode inserted through the top of the cage – ozone levels were high, more than 200 parts per billion, or double the amount considered toxic at chronic exposure in human beings. The ozone was flushed from the cage quickly for measurements, and the rats were unharmed.

The electric field used in the rat experiments is greater than that of a casual passer-by near any high voltage power line, Goheen said, the distance being the key consideration. "Distance was one variable we measured in the rats. When they were more than about 5 centimeters away from the source, we didnt see much effect."

This effect should be of concern only to those working much closer to power lines such as linemen or anyone else who spends many hours a day close to high voltage devices. Goheen is quick to note that such workers have more immediate concerns than whiffing a little ozone – such as electrocution and falling.

But he notes that if ozone is produced, it is possible that other so-called reactive species may be produced near human beings in the presence of high voltage and that "these results raise new questions about the relationships between electric fields and adverse biological effects."

Among the questions Goheen and colleagues are now wrestling with is what, precisely, happens to convert ambient air surrounding an animals electrified surfaces into its chemical cousin ozone.

In an earlier experiment, Goheen measured similar amounts of ozone in grounded water under a corona source, invoking by way of explanation something called "the Taylor cones phenomenon." A liquid surface at high field strength is unstable, with spots of slightly-higher surface charge that protrude from the surface. The tips can elongate and grow so sharp that droplets and even electrons can be ejected.

Since most mammals are mostly water and produce surface moisture in sweat glands, saliva and eyes, perhaps here is a connection. Goheen and his co-authors suggest that along with the exposed moist places, "pointed rat whiskers and hairs, as well as ears, nose, and tails, at sufficiently high field strength" contribute somehow to the discharge.

PNNL is a DOE Office of Science research center that advances the fundamental understanding of complex systems and provides science-based solutions in national security, energy, chemistry, the biological sciences and environmental quality. Battelle, based in Columbus, Ohio, has operated PNNL for DOE since 1965.

For photographers and scientists, lenses are lifesavers. They reflect and refract light, making possible the imaging systems that drive discovery through the microscope and preserve history through cameras.

But today's glass-based lenses are bulky and resist miniaturization. Next-generation technologies, such as ultrathin cameras or tiny microscopes, require...

Scientists from the University of Zurich have succeeded for the first time in tracking individual stem cells and their neuronal progeny over months within the intact adult brain. This study sheds light on how new neurons are produced throughout life.

The generation of new nerve cells was once thought to taper off at the end of embryonic development. However, recent research has shown that the adult brain...

Let’s say the armrest is broken in your vintage car. As things stand, you would need a lot of luck and persistence to find the right spare part. But in the world of Industrie 4.0 and production with batch sizes of one, you can simply scan the armrest and print it out. This is made possible by the first ever 3D scanner capable of working autonomously and in real time. The autonomous scanning system will be on display at the Hannover Messe Preview on February 6 and at the Hannover Messe proper from April 23 to 27, 2018 (Hall 6, Booth A30).

Part of the charm of vintage cars is that they stopped making them long ago, so it is special when you do see one out on the roads. If something breaks or...